System for remote testing of telephone subscribers&#39; lines



Nov. 12, 1968 c. R. DAvlEs A 3,410,965

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Nov. 12, 1968 l c. R. DAvn-:s 3,410,955

SYSTEM FOR REMOTE TESTING OF' TELEPHONE SUBSCRBERS' LINES Filed May 27, 1965 2O Sheets-Sheet '7 F/G. 7 LOCKOUT SELECTOR SELECTOR CCT. NOI

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SYSTEM FOR REMTE TESTING OF TELEPHONE E SUBSCRIBERS' LINES Filed May 27, 1965 ZO'SheetS-Sheet 8 FIG' 9 MULT|EREQUENCY CODE GENERATOR (NOT qsED) 492 l T Q x I e Bloaogfu) 45MB /454 453k: 464Yp. W I 463/ DL COMMON Nov. l2, 1968 c. R. DAvlEs 3,410,966

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VAR|A0 LE FREQUENCY RECENER Nov. l2, 1968 c. R. DAvll-:s 3,410,966

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SUBSCRIBERS" LINES 20 Sheets-Sheet `11 Nov. 12, 1968 c. R. DAvlEs SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRTBERS' LINES 2o sheets-sheet 15 Filed May 27, 1965 Nov. 12, 1968 c. R. DAvlEs SYSTEM FOR `REIVXOT TESTING OF TELEPHONE SUBSCRBERS' LINES 2o sheets-sheet 1.4

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Nov. l2, 1968 c. R. DAVIES 3,410,966

SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRIBERS LINES Filed May 27, 1965 2O Sheets-Sheet 16 MULTIFREQUENCY PREAMPLIFI ER TO ICHANNEL y ETLTERST (F1672) CHANNEL AMPE|ETER, L|M|TER ANDOETECTOR l ONEm/H28 AMP. UM LO LAI-1 7a4 T739* y 729 73| VTT/v L T WT* 7a2 TO 727A 726 L CHANNEL I )A 5, To

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Nov. l2, 1968 c. R. DAVIES 3,410,966

SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRBERs' LINES Filed May 27, 1965 20 Sheets-Sheet 17 F/G. /7 GATE GENERATOR To Aumo ``3ao 75ol 55 GATE aosmey GATE 638 (FIG. I2)

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SYSTEM FOR REMOTE TESTING OF TELEPHONE SUBSCRBERS' LINES Filed May 2'?, 1965 2O Sheets-ShamI 18 DT FIG. /9

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